Magnetic switch.



J. F. M CELROY. l

MAGNETIC SWITCH.

APPLICATION FILED Nov. I4. IQIII.

1,135,201. I f PatenteaApr. 13, 1915.

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WITNESSES: l I INVENTOR m ATT 11F. MCELROY.

MAGNETIC SWH'CH.

APPLICATION FILED Nov.14. 19H.

Patented Apr. 13, 1915.

8 SHEETS-BREST 2.

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1. F. MCELROY.

MAGNETIC SWITCH.

APPucATloN FILED4 Nov. x4. 1911.

'1,1 35,201 Patented Apr. 13, 1915.

3 SHEBTS--SHEET 3.

VWYNESSES: NVENTOR i l f V lh/1@ f di l Am'v citizen of the United States,

- UNITED STATES PATENT onirica.A

JAMES MOELROIY, 0F ALBANY, NEW YORK, ASSIIGZNI'OIEL` TO CONSOLIDATED CAR HEATING COMPANY, A CORPO T0 all whom it may concern:

Be it known that I, .JAMES F. MGELROY, a

residing atl Albany, county of Albany, State fof New York, have invented certain new and useful Improvements in Magnetic Switches, the following being a full, clear, and exact disclosure of the one form of my invention which I at present deem preferable.

For a detailed descriptionof the present. form of my invention,.reference may be had to the following specification and to the accompanying drawing, which illustrates my invention.

Figure 1 is a plan v'iew of my device; Fig. 2 is a longitudinal section thereof showing the transfer switch in elevation; Figs. 8, 4 Vand 5 show enlarged details; Fig. 6 is a diagram of the switch and its circuits.

My invention relates to magnetically operated switches, such as may be used, for ex# alnple, to. kopen and close the circuit of an electric heater under the control of a thermostat.v

Referring to the drawings A and B represent two solenoid magnets which may be of any well known construction but are shown herein as ofthe form shownr in my application for patent Ser. No. 612,810, filed March 7,' 1911, and no claim thereto is made in the present application. These magnets have in common a vreciprocating core C which is drawn in one direction or the other according as coil A or coil B is energized. n core C is mounted a casting D which serves as acontact carrier for the movable 'contacts of the switch that lthe solenoids serve to operate. The carrier D is shown on an enlarged scale in Fig. 3. VIn its upper part is clamped an insulated blade F under the plate (Z. The two ends of the blade F, when moved tothe left by the energizing of solenoid A, will engage thelixed contact clips f and f1 respectively (see Figs. 1 and y2). Each of these clips, as appears in Fig. 2, comprises two parallel springs, each having an inturned contact-plate g riveted to. its extremity. These contact-plates g areV inclined toward each other so that when the blade enters betweeny them they will be slightly forced apart and, by the yielding of the springs which carry them, will seat themselves irmlyand flatly against the opposite sides ofthe blades; The circuitwhich the switch is to control will be closed by this Specification of Letters Patent. I Application mea November 1,4, 1911.

- operation of ma RATIoN or lWEST vmcimn.

MAGNETIC SWITCH.

l Patented Apr. 13, 1915; serial No. 660,271.

engagement of blade F `withcontacts f,y f1 and opened when the blade isV withdrawn.-`

In', order to provide for 'the alternate g gnets A and B it is neces-y sary that each one, after its action is coinpleted, shall break its own circuit but close the circuit of the other magnet which is to act next to throw the core in the reverse direction. The contacts for effecting this .transfer of thev operating circuit from one magnet to the other compose whatiI designate herein as the transfer switch and I; so construct such switch that there vis no practical possibility of either magnet breakin its own circuit until it has completed its-ful stroke, nor of failing to do so whenits stroke is completed. The closure of the circuit of the other magnet is .equally insured. For this purpose the moving contacts are so managed' as to "follow different routes on 75 their in land out 'strokes passingy on one stroke beneath a spring trap which forces them on the return stroke to follow a different route along the backr of the side of the aforesaid carrier D a block G ofi insulating materialA and underneath thisiv block Gis attached a plate J (see Figs. lV and 5) to which are pivoted two spring contact-arms H and H1. A second similar plate, with similar spring contacte-arms lz and h1 thereon, is also attached tothe block G on its underside beyond 'the aforesaid e plate'J, affording in all our spring contactarms H, H1, la, h1 which coperate with the stationary trap-contacts which I will now describe, one of them being shown in detail y 4, and 5, and the others being/simi-y lar thereto. P is a base-plate set ona block of insulation M 'in the 'bottom of the switch box beneath core C. Mounted edgewise and diagonally on this base-plate l? is a trapf spring R, and also mounted edgewise 4and diagonally on the base-plate is a metal block K against whichthe sp'ringR.bears. kThe diagonal spring and `the diagonal block,` form a V-shaped assage opening toward the contactfarm Hp whose depending end,

when moved forward to the right will enter the'said passage and being drawn overpby its which areA mounted on baseeplate P, which will be presented to arm H1, and the two arms being drawn together by their spring, the arm H1 will come into contact-with and bear on block K1.

Since the arms H and H1 are in electrical communication through plate J,`the arms plates R, R1 and when those plates spring l back behind the arms, the latter are caught or trapped and ca'n not return by the same route. They. will remain in the position thus reached, maintainin the closure of the circuit at that point, a though the said circuit (which is the one that is to act subsequently to energize magnetl coil A and so produce the reverse movement of the'contacts H and H1) is still open at the thermostat or controlling switch. The above described movement of arms H and H1 toward the right into the trap-contacts has been produced by magnet-coil B, the circuit of which has .been closed in like manner at theother set of trap-contacts and is closed also at the thermostat, or controlling switch. The other set of trap-contacts are, however, reversed in position so that the V-shaped passage opens away from the contact-arms h and 71,1

-Hence at the beginning of the aforesaid movement to the right the contact-arms t and k1 are in the trapped position outside of the springs rand r1, that beingthe position in which the above description left the contact-arms H and H1. This is illustrated in Fig. 6 which shows the condition at the beginning of the movement to the right aforesaid before and H1 advanced into the V-shaped trap-passage. Consequently, while arms H and `H1 are moving into the said passage the corresponding arms 71, and

A11,1.are moving along the outside of their trap-springs r and r1 respectively and maintaining closed the circuit of magnet-coil B which produces the said movement. At the end of said movement to the right the arms is, and h1 will snap oli? the rear ends of springplates 1' and r1, as shown by dotted lines in Fig. 6. This will break the circuit of magnet B which has produced the said movement to the right, but manifestly such break will not occur until the said movement has been completed. In'the'meanwhilethe break in the circuit of magnetfA has been closed, as above described, by the engage-x ment of contact-arms H and H1 with their,

. trap-contacts. The parts will remain in the condition thus reached until the circuit of magnet A is nally closedxat the thermostat or controlling contacts. Thus the said movement to the right has, inthe case herein illustrated, opened' the main circuit of the electric heater at the main switch formed by blade F and contacts f and f1 and the heaters thereby put out of action. When, however, the temperaturev of the' car .or apartment .which the hea-ters serve has fallen low enough to cause the thermostat to close the circuit oi' magnet-coil A, thenthat magnet will act and the reverse streke of the contact-arms H, H1 will follow along the back of the trap-springs R, R1 until they snap oil' the rear ends thereof. This will break 4the circuit of coil A but only after the coil has completed its work of moving the core C andcontacts thereon to the extreme left position and thereby closing the circuit of the heater.` The same movement will, in the wa already described, close the break in the circuit of magnet coil B preparatory to the subsequent energizing of that-coil when the thermostat moves in ,the opposite direction, in response to'the heat!- ing action of the heaters, to finally close the circuit of said coil B.

Tn Fig. 6 Y represents the electric heater, the circuit thereof (controlled by la permanentrswitch. a) being indicated by single-barbed arrows. X represents'the thermostat, the tongue of which receives current from the main line via fuse a1 and delivers that current either to magnet-coilA via the circuit identilied by double-barbed arrows, or to magnet-coil B via the circuit identied by triple-barbed arrows:

What I claim as new and desire to secure by Letters Patent is:

l. An electrical switch comprising rela-j movement.

2. An electrical switch comprising. relatively reciprocable contact arms and ,contact blocks, means connected with said arms for holding them in engagement with said blocks during movement in one direction, and resilient trap members connected atone end to said blocks and having their other endsA bearingzigainst the blocks to automatically disengage said arms and blocks during the return movement, said trap members permitting rengagement of the arms and blocks at'the end of the return movement.v n v 1 V 3.v An electrical switch com rising contact blocks, contact arms mounte on a reciprocable support and having traveling contact with said blocks when moving in one direction,jsa'id contact arms being movable relative to each other, andy contact means coarms from said blocks duringthe 'return movement of said arms and (permitting reengagement at the end of sai return movement, and a spring connecting said-contact arms.

v 5. An electrical switch comprising arbase having spaced apart stationary Contact blocks', a reciprocable support provided with contact arms havngtravelin'g contact with said blocks when moving in one' direction', trap contacts secured-to saidfbase for disengaging' the lcontact arms from said contact blocks, and permitting rengagement at the end of tli'ereturn movement, and means for relatively positioning the contact arms to engage the contact blocks and the trap con-v tactsjrlesp'ectively. l l Y. v '6. An electrical "switch comprising elongated stationary contact blocks in spaced re-I lation,'travelin contact arms for engaging the contact bloc s `when moving in one directions,\means connecting thetraveling contact arms for ositionrn the latterjtoengaga the contact. b ocks, an means for causing" tbe'contact arms to be disengaged from the contact blocks during the yreturn movement Y and nntiltbe completion of said movement.

- contacts.'

10th of'lflovember 1911.

* '7. atv electrical switch. ctr-prism a par..

of diverging'v stationary contact bloc e, Inov-` able contact armsjarranged to engage said'. i

blocks during movement' inone direction,

trapcontacts coperating with the station-4 arycontacts Vto disengage the contact armsl from the contact blocks during the return' movement thereof and permitting re'e'ngagement at the end of said return movement,

and means connecting the contact arms to cause them to engage the trap contacts' duriing the return movement.

8. An electrical switch comprising pairs of stationary contact blocks, the members of each pair dlvergin'g, pairs of movable con'- tact arms corresponding to the contact blocks, and Contactin therewith during movement in one direction, trap contacts for disengaging the movable contact members fromthe contact blocks'dnring the return movement and permitting renvagement at the end of said movement, an

. "06. means Ifor.' I'causmg the movable contact arms to nor-fA mally engage the contact blocks, one pair of f contact arms being in engagement Wtliits' contact blocks when'the other pair ofco'- tact arms is engagement with trap 9. An electrical switch com cable support 'and having traveling Vcontact risingcontactj.' y blocks, contact arms mounte one recipmfv .v .75.

withr said blocks when moving'inone' direcf tion, saidcontact armsbeing' movable relai tive tc eachother, and ltrap' contacts, each trap contact being securedat 'one end to the contact block', 'tiie free'end resting ryield-V ingly against its relative contact block." j

hand, before f twa-l'subscribing .witnessegtliis "HERBERT QCLARENCE PALME;

tok

n Witness whereof I have hereunto set my. 

